test262/test/suite/ch11/11.4/11.4.1/11.4.1-4.a-1.js

/// Copyright (c) 2012 Ecma International.  All rights reserved. 
/// Ecma International makes this code available under the terms and conditions set
/// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the 
/// "Use Terms").   Any redistribution of this code must retain the above 
/// copyright and this notice and otherwise comply with the Use Terms.
/**
 * This test is actually testing the [[Delete]] internal method (8.12.8). Since the
 * language provides no way to directly exercise [[Delete]], the tests are placed here.
 *
 * @path ch11/11.4/11.4.1/11.4.1-4.a-1.js
 * @description delete operator returns true when deleting a configurable data property
 */


function testcase() {
  var o = {};

  var desc = { value: 1, configurable: true };
  Object.defineProperty(o, "foo", desc);

  var d = delete o.foo;
  if (d === true && o.hasOwnProperty("foo") === false) {
    return true;
  }
 }
runTestCase(testcase);